Fixed database typo and removed unnecessary class identifier.

venv/Lib/site-packages/skimage/viewer/utils/dialogs.py

@@ -0,0 +1,35 @@
+import os
+
+from ..qt import QtWidgets
+
+
+__all__ = ['open_file_dialog', 'save_file_dialog']
+
+
+def _format_filename(filename):
+    if isinstance(filename, tuple):
+        # Handle discrepancy between PyQt4 and PySide APIs.
+        filename = filename[0]
+    if len(filename) == 0:
+        return None
+    return str(filename)
+
+
+def open_file_dialog():
+    """Return user-selected file path."""
+    filename = QtWidgets.QFileDialog.getOpenFileName()
+    filename = _format_filename(filename)
+    return filename
+
+
+def save_file_dialog(default_format='png'):
+    """Return user-selected file path."""
+    filename = QtWidgets.QFileDialog.getSaveFileName()
+    filename = _format_filename(filename)
+    if filename is None:
+        return None
+    # TODO: io plugins should assign default image formats
+    basename, ext = os.path.splitext(filename)
+    if not ext:
+        filename = '%s.%s' % (filename, default_format)
+    return filename